Abstract
IT has long been recognised that the distribution of freshwater copepods has been profoundly influenced by the incidence of the glacial period, since the lake-districts which they inhabit are to a large extent postglacial catchment basins. It so happens that there is a general correspondence between the three leading sub-orders and the three principal life-zones of lakes, namely, the creeping Harpacticoida of the littoral zone, the swimming Cyclopoida of the neritic zone, and the pelagic Calanoida of the open water. In the genus Cyclops there are upwards of twenty species common to the fauna of Norway (representing northern Europe) and of Germany (representing central Europe). Two significant differences are the absence of C. capillatus from Germany and the absence of C. prasinus from Norway, both of these species occurring in Canada.
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WILLEY, A. Copepods in the Northern Hemisphere. Nature 116, 206 (1925). https://doi.org/10.1038/116206a0
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DOI: https://doi.org/10.1038/116206a0
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